ocs_doc_api: Phase 5 (media & misc, read-mostly)

- entity_kind_name names the media/misc families (RasterImage, Table, Leader,
  MultiLeader, MLine, Mesh, Helix, Region, Body, Surface, Face3D, Dimension,
  Hatch) so GetEntity reports a real kind instead of 'Other'.
- RasterImage coarse bounds (insertion + u*width + v*height).
- Generic delete already works on these families; no typed create in v1
  (read-only EntityView per plan).
- spec RasterImage/Table read-mostly families; IMPLEMENTATION.md updated.
- Test phase5_media_entities_read_kind_and_bounds -> 601 host lib green.

crates/ocs_doc_api/IMPLEMENTATION.md

@@ -75,10 +75,14 @@ variants append at enum end.
   viewport-view query (view target/center/scale DTOs).
 
 ### Phase 5 — media & misc (read-mostly)
-- **Entities:** raster image, underlay, table, light.
-- **Methods:** CRUD + property queries; few/no geometric actions. These families
-  largely stay read-only `EntityView` DTOs — typed ops only where the spec
-  declares an action mapping.
+- **Done:** media/misc families report a **real `kind`** via `GetEntity`
+  (`RasterImage`, `Table`, `Leader`, `MultiLeader`, `MLine`, `Mesh`, `Helix`,
+  `Region`, `Body`, `Surface`, `Face3D`, `Dimension`, `Hatch`) instead of "Other";
+  `RasterImage` has coarse bounds (insertion + u·width + v·height); generic
+  `delete` works on all. Covered by `phase5_*` test.
+- **Remaining:** typed create/property ops for `RasterImage`/`Table`/light;
+  these largely stay read-only `EntityView` DTOs (typed ops only where the spec
+  declares an action mapping).
 
 ## 🔧 Outstanding methods on supported families